“I am unclear about the various parameters of what constitutes a beryah.
What if you eat the little tomato in two bites?
What about a peach if you don’t eat the pit?
Is an egg a beryah?
I’d like to hear some discussion about it.”
1. It doesn’t matter how many bites you eat the tomato in. However, it’s possible that if it takes you more than 9 minutes to eat it, it might be okay. (although I don’t know if you will be).
2. If you don’t eat the peach pit, it’s not a beryah. However, I think all peaches are a k’zayis anyhow.
3. I don’t know if an egg is a beryah or not, but it’s definitely a k’zayis, so there’s no safeik and you definitely need a bracha achrona anyhow.